Question: How long was Ub Iwerks a teacher at Northeast High School
Paraphrase: what was the tenure of Ub Iwerks as a teacher at Northeast High School?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q336424 p:P69 ?s . ?s ps:P69 wd:Q7057903 . ?s pq:P582 ?value}